@Setanta,
fair point, but it's not just muslisms debating islam that can be irrational. i've seen some pretty stupid comments on here from people who (i'm guessing from their names/handles) are not muslim, on all sorts of topics.
sometimes when we are passionate about things, and try to debate them, we can let emotion take over, start rambling, and stop making sense. this happens to us all, just read some of my posts for proof lol.
i also think matters of faith quickly descend into he said/she said style mudslinging, as the faithful are true to their faith in the face of a lack of hard evidence, and non-believers cannot understand absolute faith without any evidence. this will always lead to arguements as each is convinced they are right.